The Trail problem from the 2010 AP Computer Science Exam is typical of free response problems that test arrays. The problem requires you to find the minimum and maximum in an array and access 2 elements of an array for each loop run.

The GridChecker problem from the 2010 AP Computer Science Exam is typical of free response problems that test GridWorld: The AP Computer Science Case Study. The problem requires you to run multiple methods of the Grid interface with correct implicit and explicit parameters and to handle the return types.